Suftanate of Oman Minitry of Hiyher Eáucation Chemistry 1 – ENDR1101: Tutorial (3) – Chapter 3 p Depa 27. An element consists of 1.40% of an isotope with mass 203.973 amu, 24.10% of an isotope with mass 205.9745 amu, 22.10% of an isotope with mass 206.9759 amu, and 52.40% of an isotope with mass 207.9766 amu. Calculate the average atomic mass and identify the element. 30. Assume silicon has three major isotopes in nature as shown in the table below. Fill in the missing information. Isotope Mass (amu) Abundance 28Si 29Si 32Si 27.98 4.70% 29.97 3.09% 37. Aluminum metal is produced by passing an electric current through a solution of aluminum oxide (Al,O,) dissolved in molten cryolite (Na;AIF). Calculate the molar masses of Al,O; and NazAIF6. 55. What number of atoms of nitrogen are present in 5.00 g of each of the following? a. glycine, C,H;O,N b. magnesium nitride calcium nitrate d. dinitrogen tetroxide 62. Arrange the following substances in order of increasing mass percent of carbon. a. caffeine, C,H1,N,O, b. sucrose, C,H20| c. ethanol, C,H,OH 69. The compound adrenaline contains 56.79% C, 6.56% H, 28.37% O, and 8.28% N by mass. What is the empirical formula for adrenaline? 73. A compound containing only sulfur and nitrogen is 69.6% S by mass; the molar mass is 184 g/mol. What are the empirical and molecular formulas of the compound? Sultanate of Oman Minitry of Hiyher Education Chemistry 1– ENDR1101: Tutorial (3) – Chapter 3 C epa 81. Give the balanced equation for each of the following chemical reactions: ose (C,H1,0,) reacts with oxygen gas to produce gaseous dioxide and water vapor. ron(III) sulfide reacts with gaseous hydrogen chloride m solid iron(III) chloride and hydrogen sulfide gas. e carbon disulfide liquid reacts with ammonia gas to produce hydrogen sulfide gas and solid ammonium thiocyanate
Suftanate of Oman Minitry of Hiyher Eáucation Chemistry 1 – ENDR1101: Tutorial (3) – Chapter 3 p Depa 27. An element consists of 1.40% of an isotope with mass 203.973 amu, 24.10% of an isotope with mass 205.9745 amu, 22.10% of an isotope with mass 206.9759 amu, and 52.40% of an isotope with mass 207.9766 amu. Calculate the average atomic mass and identify the element. 30. Assume silicon has three major isotopes in nature as shown in the table below. Fill in the missing information. Isotope Mass (amu) Abundance 28Si 29Si 32Si 27.98 4.70% 29.97 3.09% 37. Aluminum metal is produced by passing an electric current through a solution of aluminum oxide (Al,O,) dissolved in molten cryolite (Na;AIF). Calculate the molar masses of Al,O; and NazAIF6. 55. What number of atoms of nitrogen are present in 5.00 g of each of the following? a. glycine, C,H;O,N b. magnesium nitride calcium nitrate d. dinitrogen tetroxide 62. Arrange the following substances in order of increasing mass percent of carbon. a. caffeine, C,H1,N,O, b. sucrose, C,H20| c. ethanol, C,H,OH 69. The compound adrenaline contains 56.79% C, 6.56% H, 28.37% O, and 8.28% N by mass. What is the empirical formula for adrenaline? 73. A compound containing only sulfur and nitrogen is 69.6% S by mass; the molar mass is 184 g/mol. What are the empirical and molecular formulas of the compound? Sultanate of Oman Minitry of Hiyher Education Chemistry 1– ENDR1101: Tutorial (3) – Chapter 3 C epa 81. Give the balanced equation for each of the following chemical reactions: ose (C,H1,0,) reacts with oxygen gas to produce gaseous dioxide and water vapor. ron(III) sulfide reacts with gaseous hydrogen chloride m solid iron(III) chloride and hydrogen sulfide gas. e carbon disulfide liquid reacts with ammonia gas to produce hydrogen sulfide gas and solid ammonium thiocyanate
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Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Question
Transcribed Image Text:4G
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Suftanate of Oman
Minitry of Hiyher Education
Chemistry 1 – ENDR1101: Tutorial (3) – Chapter 3
gg Depa
27. An element consists of 1.40% of an isotope with mass 203.973
amu, 24.10% of an isotope with mass 205.9745 amu, 22.10% of
an isotope with mass 206.9759 amu, and 52.40% of an isotope
with mass 207.9766 amu. Calculate the average atomic mass and
identify the element.
30. Assume silicon has three major isotopes in nature as shown in
the table below. Fill in the missing information.
Isotope
Mass (amu)
Abundance
28Si
29Si
27.98
4.70%
32Si
29.97
3.09%
37. Aluminum metal is produced by passing an electric current
through a solution of aluminum oxide (Al,O;) dissolved in
molten cryolite (Na;AIF,). Calculate the molar masses of Al,O,
and Na;AIF.
55. What number of atoms of nitrogen are present in 5.00 g of each
of the following?
a. glycine, C,H;O,N
b. magnesium nitride
c. calcium nitrate
d. dinitrogen tetroxide
62. Arrange the following substances in order of increasing mass
percent of carbon.
a. caffeine, C,H10N,O2
b. sucrose, C,H20|
c. ethanol, C,H,OH
69. The compound adrenaline contains 56.79% C, 6.56% H, 28.37%
O, and 8.28% N by mass. What is the empirical formula for
adrenaline?
73. A compound containing only sulfur and nitrogen is 69.6% S by
mass; the molar mass is 184 g/mol. What are the empirical and
molecular formulas of the compound?
Suftanate of Oman
Minitry of Hyher Eáucation
Chemistry 1 – ENDR1101: Tutorial (3) – Chapter 3
81. Give the balanced equation for each of the following chemical
reactions:
ose (C,H120,) reacts with oxygen gas to produce gaseous
dioxide and water vapor.
ron(III) sulfide reacts with gaseous hydrogen chloride
m solid iron(III) chloride and hydrogen sulfide gas.
e cafbon disulfide liquid reacts with ammonia gas to produce
hydrogen sulfide gas and solid ammonium thiocyanate
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